OK so i need to make a .75" piston valve. i have a .75" tee an i would prefer to use metal parts even though i will operate th cannon under 200 psi to my understanding metal is much safer than pvc. please help, all helpful input is appreciated i only have a scroll saw, hand held drill, dremel, and other hand tools i do not have access to a lathe or a drill press. a link to a tutorial would be the best